It seems that bees understand what zero is

Scientists are alleged to have demonstrated that honey bees have the capacity to count and discriminate up to four objects.

It seems that honey bees can discriminate between greater than and less than and as such can understand the concept of zero numerosity. Scientists suggest that honey bees seem to understand the concept of zero in relationship to other numerical values and that zero is lower than one. Scientists are now speculating that because insects, with different brain structures from birds and primates can understand the concept of zero as to whether such capacities might exist in other animals too. If this topic is of interest to you click here.